The MOU is the "less than treaty status" part. It is backed by a full treaty signed in 2016.
I think your confusion might be caused by that table which is not the best (a lot due to the fact that much of the agreements are in confidence and not publicly available).
But as per the
senate review:
Timeline of the decision
The Department of Infrastructure, Transport, Regional Development, Communications and the Arts (DITRDCA) took the committee through the timeline in relation to the request from Qatar Airways. The request was received by DITRDCA on 22August 2022 and it was considered 'a straightforward amendment to the MOU which forms part of a treaty which establishes the capacity arrangements'.